Taskbar: You see, this is the problem...

Taskbar: You see, this is the problem with some people.

If instead of merely looking at the manual, you had actually tried to play the game, you'd have seen that the mouse works in a way very different from any "modern" game. So while, technically, you are right, the game does have mouse support, in actual fact, "mouse support" in this game is not what a "modern gamer" would expect. And the "mouse support" makes the game very, very awkward to play.